For service and parts needs, visit your dealer. You will receive genuine GM parts and GM-trained and supported service people.
Genuine GM parts have one of these marks:

Vehicle Care
California Proposition 65 WarningDriver or Passenger Seat Replacement
Removal Procedure
Warning: Refer to SIR Warning in the Preface section.
Warning: When carrying a live inflator module, make sure the bag
opening is pointed away from you. This minimizes the chance of
injury in the case of an accidental deployment. Never carry the inflator module
by the wi ...
Deployment Outside Vehicle - Steering Wheel Module, Instrument Panel
Module, and Roof Rail Module
Deploy the inflator module outside of the vehicle when the vehicle will be
returned to service. Situations that require deployment outside
of the vehicle include the following:
Using the SIR diagnostics, you determine that the inflator module is
malfunctioning
The inflator module is cosm ...
Anti-Corrosion Treatment and Repair (Base)
Warning: When applying sound deadeners, or anti-corrosion materials
due care and preventative measures must be exercised to prevent
any material from being sprayed into door and quarter panel mechanisms such as
door locks, window run channels, window regulators and
seat belt retractors, as wel ...